I tested yesterday morning and had 2.5 FC. I added 121 oz of 8.25 clorox to bump it up to 7 or a touch above. We lounged in the pool yesterday and I went to test this morning and the sample won't turn pink. No way I lost all fc one day. I added small amounts of acid over the past couple days to lower TA and was about to aerate to bump PH back up. Now this??? Water is clear and beautiful, fresh off of partial drain and refill to lower cya..
The end of the tester spoon is black, but the powder inside is dry. Is there any way this suff goes bad overnight?
20000 gallon in ground vinyl
hayward super 2 - 1 hp pump